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1989 — Poqet PC
When you think of pocket PC, you normally think of Microsoft's early PDA efforts, but this one from the Poqet Computer Corporation appeared in 1989 and brought power to the handheld category. It did so by running MS-DOS on a tiny clamshell device that could run 10 to 100 hours on two AA batteries. This was accomplished by aggressive power management techniques employed by Poquet.
Fujitsu bought Poqet and released one advanced model, the Poqet PC Plus, with more memory, I/O capability, and PCMCIA card expansion. Unfortunately, this model was bigger and weighed almost two pounds, and it was expensive, so it never went anywhere.